Rule breakers will be told to delete any images immediately for fears the snaps could reveal how others voted

Voters have been warned not to take selfies inside polling booths when casting their vote.

The Electoral Commission said the craze for taking self-portraits with mobile phones may lead to breaches of strict election rules.

‘No photography’ signs will be installed at polling stations around the country.

Officials said any photographs taken inside polling stations will have to be deleted immediately.

“We have told staff that if they see anyone taking a photograph they should ask the person to delete it - but not try to wrestle the phone out of their hands,” said an electoral services manager in the East of England.

The Electoral Commission fears people taking selfies could accidentally reveal details about how they, or someone else, has voted, potentially putting them in breach of the law.

Electoral rules state that anyone who inadvertently reveals how someone else votes in tomorrow’s local and European elections could face a £5,000 fine or six months in prison.

But John Turner, chief executive of the Association of Electoral Administrators, said the law is outdated and unclear.

“There is not an Act of Parliament that says you should not take a selfie inside a polling station,” he said.

“This is essentially a piece of Victorian legislation - and they didn’t have mobile phones back then.”

The Law Commission said it was reviewing all legislation on the way elections are conducted, including rules about secrecy.